add bbox support for CSV and GeoJSON feature providers

[tomkralidis]

Overview

This PR adds bbox support for CSV and GeoJSON providers using Shapely (which is already part of the core dependency chain).

Related Issue / discussion

Somewhat related to #2000

Additional information

None

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[doublebyte1]

+1 for these improvements! 👍🏽

Please check some minor comments.

[doublebyte1]

If the bbox tests are removed from here, does it mean we are going to create separate tests for each features (and records) provider?

[tomkralidis]

I removed this test because of previous behaviour of WxS (if property is null, it doesn't evaluate to true n a query/match). Looking at OAFeat Req 24C, I've updated this to true, hence restorng the existing behaviour in tests/api/test_itemtypes.py (the remaining changes being updating the miny value in the request and the resulting links).